I'm using SA6 right now with the pretty dark yet detailed Treble= tips - and these end at 16k.
I can live with their treble being boosted, (a simple +6 dB smiley curve approximates my real eq somewhat - good enough for a cellphone) but that sounds unnaturally metallic to my ears.
My current EQ for these has a -6dB 9k cut (pretty wide) with only extreme high end (>12k +3dB/oct) boost countering their roll-off quite effectively - but bandwidth cannot be improved with EQ.
That's with Comply T-100s, however they don't change HF behavior, suprisingly enough.
JVC HA-FX700 is not available anywhere in EU, also I am somewhat annoyed by too much sibilance.
Say, too much by +6 dB would require eq, and at +3 dB I'd consider eq as well.
The perfect signature for me is pretty laid back and not overly bright, closer to HD650 and HD800 rather than Beyerdynamic DT880 and definitely unlike Grados.
From seyo-shop (or other Japan), it'd be $350 + tax & duty pushing it to monstrous (pun intended - MTPC is similar price locally) $500 levels.
My wallet would explode after hearing this price tag, not to mention paying it.
We'll see how it goes though with those VSonics - whether they're actually available etc.